The Big Programming Thread - Page 920

On November 21 2017 10:08 Hanh wrote:
Nice! Was it because the credentials were not passed to the transaction 'send funds'?

On November 21 2017 13:34 WarSame wrote:
As a follow on to that previous post, if you can generate an address from a private key what's to stop you from simply running through a ton of private keys, generating their addresses, and taking that ethereum?

On November 21 2017 09:53 WarSame wrote:
I got the code I was working on to finally work muthafuckas!!!

@Blisse, is that because it slots into Java really nicely? I glanced through their pages and didn't see anything that made it a must-have, but then again I also don't know much.

On November 22 2017 19:56 R1CH wrote:


I always liked this image.

https://i.imgur.com/MUQoSzy.jpg

On November 23 2017 06:41 mantequilla wrote:
what do I need to become to understand Shor's algorithm as easily as I understand baked chicken with potatoes recipe?

On November 23 2017 04:42 enigmaticcam wrote:
Question on C#.NET and Entity Framework.

I'm trying to implement this: https://github.com/mehdime/DbContextScope. Basically an easy way to create and manage DbContext. The problem is that my DbContext requires a connection string to be provided programmatically rather than directly from the config file. He's got a factory interface that I can implement to provide my own DbContext. I can't seem to figure out how to get it to work though. I'm pretty sure this is probably just a problem with my understanding of generic interfaces.

Here's a sample of what I'm trying to do:

    // This is the DbContext factory. MSEntities is my DbContext, which requires a ConnectionToken.
    public class MSEntitiesContextFactory : IDbContextFactory<MSEntities> {
        private ConnectionToken _token;

        public MSEntitiesContextFactory(ConnectionToken token) {
            _token = token;
        }

        public MSEntities Create() {
            return new MSEntities(_token);
        }
    }

    public class Test {
        public void PerformTest(ConnectionToken token) {
            IDbContextFactory<MSEntities> dbContextFactory = new MSEntitiesContextFactory(token);
            using (DbContextScope scope = new DbContextScope(dbContextFactory)) {
                // Do stuff
            }
        }
    }

I get an error on the "using" line saying: "cannot convert from 'System.Data.Entity.Infrastructure.IDbContextFactory<MSEntities>' to 'EntityFramework.Db.ContextScope.Interfaces.IDbContextFactory'".

The constructor for DbContextScope requires just the IDbContextFactory. But the IDbContextFactory is a generic interface. How do I implement that interface using my custom DbContext (MSEntities)?

Here is the IDbContextFactory interface, for reference:

    public interface IDbContextFactory<out TContext> where TContext : DbContext {
        //
        // Summary:
        //     Creates a new instance of a derived System.Data.Entity.DbContext type.
        //
        // Returns:
        //     An instance of TContext
        TContext Create();
    }

On November 23 2017 11:20 Hanh wrote:Looks like it is not the same name space even. Does he have his own definitions of entity framework types?

On November 23 2017 04:42 enigmaticcam wrote:
Question on C#.NET and Entity Framework.

I'm trying to implement this: https://github.com/mehdime/DbContextScope. Basically an easy way to create and manage DbContext. The problem is that my DbContext requires a connection string to be provided programmatically rather than directly from the config file. He's got a factory interface that I can implement to provide my own DbContext. I can't seem to figure out how to get it to work though. I'm pretty sure this is probably just a problem with my understanding of generic interfaces.

Here's a sample of what I'm trying to do:

    // This is the DbContext factory. MSEntities is my DbContext, which requires a ConnectionToken.
    public class MSEntitiesContextFactory : IDbContextFactory<MSEntities> {
        private ConnectionToken _token;

        public MSEntitiesContextFactory(ConnectionToken token) {
            _token = token;
        }

        public MSEntities Create() {
            return new MSEntities(_token);
        }
    }

    public class Test {
        public void PerformTest(ConnectionToken token) {
            IDbContextFactory<MSEntities> dbContextFactory = new MSEntitiesContextFactory(token);
            using (DbContextScope scope = new DbContextScope(dbContextFactory)) {
                // Do stuff
            }
        }
    }

I get an error on the "using" line saying: "cannot convert from 'System.Data.Entity.Infrastructure.IDbContextFactory<MSEntities>' to 'EntityFramework.Db.ContextScope.Interfaces.IDbContextFactory'".

The constructor for DbContextScope requires just the IDbContextFactory. But the IDbContextFactory is a generic interface. How do I implement that interface using my custom DbContext (MSEntities)?

Here is the IDbContextFactory interface, for reference:

    public interface IDbContextFactory<out TContext> where TContext : DbContext {
        //
        // Summary:
        //     Creates a new instance of a derived System.Data.Entity.DbContext type.
        //
        // Returns:
        //     An instance of TContext
        TContext Create();
    }

  public class MSEntitiesContextFactory : IDbContextFactory
  {
    private readonly ConnectionToken _token;

    public MSEntitiesContextFactory(ConnectionToken token)
    {
      _token = token;
    }
    public TDbContext CreateDbContext<TDbContext>() where TDbContext : class, IDbContext
    {
      return typeof(TDbContext) == typeof(MSEntities)
        ? new MSEntities(token: _token) as TDbContext
        : Activator.CreateInstance<TDbContext>();
    }
  }
}

    public void PerformTest(ConnectionToken token)
    {
      var myFactory = new MSEntitiesContextFactory(new ConnectionToken());
      var scopeFactory = new DbContextScopeFactory(myFactory);
      //if you want to use the ambient scope
      var ambientScope = new DbContextScope(myFactory);
      using (IDbContextScope scope = scopeFactory.Create())
      {
       var asd = scope.DbContexts.Get<MSEntities>().Persons.Add(new Person());
        // Do stuff
      }
    }

On November 24 2017 01:55 Fwmeh wrote:I'll start with recommending not using that abstraction. I have some experience with it, but only found it clumsy.

On November 24 2017 02:14 enigmaticcam wrote:
Thank you! That was the syntax I needed, and that works. Really appreciate it!


You mean not using the DbContextScope? Since I was about to start using it, I'm curious as to why you thought it was clumsy. Any recommendations as to how to manage DbContext correctly?

On November 23 2017 18:17 Manit0u wrote:

Most awesomest easter egg ever.

On November 24 2017 03:02 phar wrote:


Idk I still think that the fully functional flight simulator they built into Excel is a way more awesome and intensive Easter egg.